I agree with you, I don't think is fair to put Bellingham together with Mbappé and Vinicius. These two are real primadonna, they want to be the star of the team therefore they always try to do what is better for them rather than for the team. And the fact usually there is only one real star per team doesn't help because they both think they are the best. They play first for themselves, the team comes later.
If the player realizes the importance of a team collectively then I am sure this will be the basis for the need to work together.
Individual success will be obtained if all players are concerned with the team because in this way they can achieve success.
But sometimes there are one or two players who look a little selfish because they are too forced from scoring goals even though the chances are small.
Vinicius and Mbappe may have been in these conditions because they are both on the front lines so they are more prominent at that time they did.
That's what must be done, but it's not easy to unite star players in a team like Real Madrid's current one, which boasts numerous star players who naturally have enormous egos. It's the coach's role to foster chemistry and manage their egos.
Vinicius and Mbappé are often rumored to have a rift due to their egos, but I don't think so.